JPH09325394A - Automatic recovery method and device for error in loading, for camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an automatic recovery from an error in loading caused by the fact that a film is pulled out too much by repeating the unwinding/ winding operations of the film, based on a pulse signal, when the error in loading occurs. SOLUTION: When the error in loading occurs, a film winding motor 18a is stopped and a film unwinding motor 18b is driven to move the film in a direction where the film is unwound into a film cartridge 15. When a fixed number of pulses are generated within a specified time, because the film unwinding motor 18b is driven, it is decided that the error in loading is due to the fact that the film is pulled out too much. When the number of pulses reaches a certain number, the film unwinding motor 18b is stopped and the film winding motor 18a is driven. Further, when the fixed number of pulses required for loading are generated within the specified time, it is judged that the film is normally wound on a spool and taken up, so that the film winding motor 18a is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for automatically recovering an error in loading when a film is loaded into a camera.

[0002]

2. Description of the Related Art Loading errors in a camera equipped with an auto loading mechanism can be classified into the following three types. The amount of the film F pulled out from the cartridge is too small to reach the film take-up spool S (or the film feed sprocket) (FIG. 4). The amount of the film F pulled out is too large, so that the film F sags in the spool chamber and the film perforation does not get caught on the claws of the spool S (FIG. 5). The film F once wraps around the spool S, but because the film withdrawal amount is too large, the leading edge of the film swims and hits the back surface of the film to be unwound (FIG. 6). Note that FIG. 7 shows a normal film set state. The loading error of (1) can be achieved by opening the back cover and further pulling the film out of the cartridge and reloading it. However, the loading error of (1) requires the film to be pushed into the cartridge, which is troublesome.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to automatically recover a loading error from the above, that is, a loading error caused by too much film being drawn from the cartridge. To do.

[0004]

SUMMARY OF THE INVENTION According to the method of the present invention, a camera having an automatic loading mechanism for loading a film and detecting the amount of transferred film by pulse signals of a number proportional to the transferred amount is used. When a loading error occurs due to, the film rewinding operation and the film winding operation are repeated a predetermined number of times based on the pulse signal to complete the loading. The film rewinding operation and the film winding operation are switched when the pulse signal reaches a predetermined number. Further, it is preferable that the number of pulses for switching the film rewinding operation and the film winding operation is changed for each repetitive operation.

According to the expression of the present invention, the present invention describes a film winding motor for winding up a film fed from a patrone; a film feed detecting means for generating a pulse signal of a number proportional to the transfer amount of the film; A film rewinding motor for returning; a back cover switch for detecting that the camera back cover is closed; and a motor control means for controlling the film rewinding motor and the film rewinding motor. In a camera with an auto-loading mechanism, which operates the film winding motor when the back cover switch detects the closing of the back cover, and stops the operation of the film winding motor when the film feed detection means generates a predetermined number of pulses. The control means also activates the film rewind motor when a loading error occurs. When the film feed detecting means generates a predetermined number of pulses, the film rewinding motor is stopped to operate the film winding motor, and when the film feed detecting means generates a predetermined number of pulses, the film winding motor is turned on. It is characterized by stopping.

In the present invention, automatic recovery cannot be performed in the case of a loading error caused by a small drawing amount of the film. Therefore, the motor control means stops the film rewinding motor when the film rewinding motor first operates the film rewinding motor, and when the film feed detection means does not generate a pulse within a predetermined time, the motor control means stops the error. It is preferable to display.

Further, in order to deal with the case where the loading error cannot be recovered by one rewinding operation and one winding operation, the motor control means, even if the film winding motor is operated after the loading error occurs, the film feeding is performed. When the detection means does not generate the predetermined number of pulses, it is preferable that the film rewinding motor and the film rewinding motor are alternately operated. In this operation, it is preferable that the number of pulses for switching between the film rewinding operation and the film winding operation is changed for each repeated operation.

The film rewinding motor and the film rewinding motor may of course be separate motors, but it is practical to use a common motor.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, a camera body 11 using CH135 film (35 mm film).
Has a cartridge chamber 12 and a spool chamber 13 on the left and right sides thereof, and a photographing opening (aperture) 14 is located between the chambers. The film F pulled out from the film cartridge 15 loaded in the cartridge chamber 12 has the photographic opening 1
4 is wound on the film winding spool 16 in the spool chamber 13. The spool 16 is provided with a claw 16a protruding into the perforation P of the film F.

A common winding / rewinding motor 18 is located in the spool 16. This winding / rewinding common motor 18 is
For example, at the time of normal rotation, the spool 16 is rotated in the film winding direction, and at the time of reverse rotation, the spool 16 is not rotated through a gear train (not shown), and the cartridge chamber 12 is rotated.
The film rewinding fork 19 therein is rotated in the film rewinding direction. Such a switching gear mechanism is well known in the field of cameras, and illustration and description of the specific mechanism are omitted. Of course, film winding motor (film winding motor)
The film rewinding motor and the film rewinding motor can be provided separately, and in FIG.
a and the film rewinding motor 18b.

In the camera body 11, a photo interrupter 20 is provided near the photographing opening (aperture) 14 at a position where the perforation P of the film F passes. The photo interrupter 20 is a pulse generator that generates one pulse each time the perforation P passes through. The camera body 11 is further provided with a back cover 21 and a back cover close detection switch 22 that detects that the back cover 21 is closed.

The film winding motor 18a, the film rewinding motor 18b, the photo interrupter 20, and the back cover close detection switch 22 described above are connected to a motor control circuit 24 as shown in FIG. A display device (LCD) 25 is further connected to 24. The display device 25 is provided, for example, on the upper surface of the camera body 11. The film winding motor 18a and the film rewinding motor 18b are connected to a motor control circuit 24 via drive circuits 26 and 27.

FIG. 3 is a flowchart showing an operation example of the loading error automatic recovery device according to the present invention. The operator puts the film cartridge 15 into the cartridge chamber 12, puts the film F pulled out from the film cartridge 15 on the take-up spool 16, and closes the back cover 21. This back lid close detection is detected by the back lid close detection switch 22, and the operation flow of FIG. 3 starts.

When the back cover close detection switch 22 is closed,
The initial value 1 is set to the film rewinding reference value n in the automatic recovery operation from the abnormal loading, the film winding motor 18a rotationally drives the spool 16 in the film winding direction, and the timer is reset (steps S1 and S2). ,
S3). In a normal state, the claw 16a is caught by the perforation P of the film F, the winding is started, and the film is fed. Therefore, the photo interrupter 20 generates a predetermined number of pulses within a fixed time. The motor control circuit 24 counts the number of pulses, and when it confirms that the predetermined number of pulses (e.g., 8) have been input within the fixed time set by the timer, it stops the film winding motor 18a, The number of shots "1" is set on the display device 25, and a normal shooting routine is entered (steps S4, S5, S25 to S27).

On the other hand, if it is determined in steps S4-0, S4 and S5 that there is a loading error (that is, if a predetermined number of pulses are not generated within the predetermined time set by the timer), the film winding motor 18a is stopped. , The film rewinding motor 18b is driven to move the film F in the film rewinding direction into the film cartridge 15, and
The timer is reset again and the number of pulses is counted (steps S7, S8, S9, S10). Then, a predetermined number of photo interrupters 20 (for example, 1
It is checked whether or not (individual) pulses have been generated (steps S11 and S12). If the pulse is not generated within the predetermined time, it is determined that the loading error is caused by the insufficient pull-out amount of the film F shown in FIG. 4, and the loading error cannot be automatically recovered. A loading error is displayed and the process ends (steps S12, S13, S14).

When a predetermined number of pulses are generated within a predetermined time as a result of driving the film rewinding motor 18b,
When it is determined that there is a loading error due to the film F of FIG. 5 or 6 being pulled out too much, and the number of pulses reaches a certain number of pulses (f (n)), the film rewinding motor 18b is stopped. The film winding motor 18a is driven. In other words, wind up again (steps S15, S
16). Then, the timer is reset (S17), and it is checked whether or not a predetermined number of pulses are generated within a predetermined time (S18, S19, S20).

The smaller the number of f (n) pulses in step S12, the finer the control can be made. However, if this is fixed at "1", in the case of a loading error of the type shown in FIG. Since there is a possibility that the film F only reciprocates and cannot be automatically recovered, if the film cannot be recovered even after being rewound by f (n) pulses, the rewinding amount is gradually increased until it can be recovered. Step S
The setting of the rewinding reference value n = 1 of 1 is for this step S12.

In step S16, the film winding motor 19
As a result of starting a and rewinding the film, the following control is performed depending on whether or not the photo interrupter 20 has generated a predetermined number of pulses within a fixed time. a. When a predetermined number of pulses (e.g., 8 pulses) necessary for loading occur within a fixed time, the film F is normally wound around the spool 16 and wound (returned).
Therefore, the film winding motor 18a is stopped and the display device 2
The number of shots "1" is set to 5 and a normal shooting routine is entered (steps S19, S25 to S27).

B. When the predetermined number of pulses (e.g., 8) required for loading have not been generated within the fixed time, after stopping the hoisting motor 19a, it is further checked whether or not the pulse is zero (step S2).
0, S21, S22). If the generated pulse is zero, it is determined that the rewinding amount is insufficient, and the rewinding and winding processes are executed again (steps S22, S8 to S20). As a result, if the correction of the loading error is successful, the film winding motor 18a is stopped, the number of shots "1" is set on the display device 25, and the normal shooting routine is started (steps S19, S25 to S27). On the other hand, if the generated pulse is not zero, the unwinding state of FIG. 6 is determined, and 1 is added to the rewinding reference value n on condition that the rewinding reference value n has not reached the predetermined limit value Limit. Then, the number of rewinding pulses f (n) is increased, and rewinding and winding are repeated (steps S22 to S24, S8 to S20). As a result, when the correction of the loading error is successful, the film winding motor 18a is stopped, the number of shots "1" is set on the display device 25, and the normal shooting routine is started (steps S25 to S27). If the rewinding reference value n reaches n = Limit, that is, if the loading error is not resolved even after repeating (Limit-n-1) times, it is determined that the loading error could not be corrected and the display device 25
Displays a loading error and ends (step S
24, S13, S14).

As described above, according to the present invention, even if the film winding motor 18a and the film rewinding motor 18b are separate motors, there is no problem in control. However, in an actual camera, one motor is used for winding and rewinding. In most cases, the present invention does not exclude the case where a dual-purpose motor is used.
Further, according to the present invention, in the flowchart shown in FIG. 3, the number of rewinding pulses f (n) at the time of loading error
Can be configured to have a value obtained by adding one or more pulse numbers to the pulse number counted in step S4 or S18.

[0021]

As described above, according to the present invention, it is possible to automatically recover the loading error caused by the excessively large amount of the film pulled out from the cartridge.

[Brief description of drawings]

FIG. 1 is a rear view of an open state of a back cover showing an example of a camera to which a device for automatically loading errors according to the present invention is applied.

FIG. 2 is a block diagram showing an embodiment of a loading error automatic recovery device of the present invention.

FIG. 3 is a flowchart showing an operation example of the loading error automatic recovery device of the invention.

FIG. 4 is a cross-sectional view showing an example of a loading error.

FIG. 5 is a sectional view showing another example of a loading error.

FIG. 6 is a sectional view showing still another example of a loading error.

FIG. 7 is a sectional view showing a normal loading state.

[Explanation of symbols]

 11 camera body 12 patrone chamber 13 spool chamber 15 film patrone 16 spool 18 winding / rewinding common motor 18a film winding motor 18b film rewinding motor 19 film rewinding fork 20 photo interrupter (pulse generator) 21 back cover 22 back cover detection Switch 24 Motor control circuit 25 Display device

Claims (8)

[Claims] 1. A camera which has an auto-loading mechanism for loading a film and detects the transfer amount of the film by a pulse signal of a number proportional to the transfer amount, when the loading error occurs due to the auto-loading mechanism. A method for automatically recovering a loading error of a camera, characterized in that a film rewinding operation and a film winding operation are repeated a predetermined number of times based on a signal to complete loading. 2. The automatic loading error recovery method according to claim 1, wherein the film rewinding operation and the film winding operation are switched when the pulse signal reaches a predetermined number. 3. The loading error automatic recovery method according to claim 2, wherein the number of pulses for switching the film rewinding operation and the film winding operation is changed for each repetitive operation. 4. A film winding motor for winding a film fed from a cartridge; a film feed detecting means for generating a pulse signal of a number proportional to the amount of film transfer;
A film rewinding motor that rewinds the film into the cartridge; a back cover switch that detects when the camera back cover is closed;
And a motor control means for controlling the film winding motor and the film rewinding motor; the motor control means operates the film winding motor when the back cover switch detects the closing of the back cover when the film is loaded. In a camera with an auto-loading mechanism that stops the operation of the film winding motor when the film feed detecting means generates a predetermined number of pulses, the motor control means further operates the film rewinding motor when a loading error occurs. When the film feed detection means generates a predetermined number of pulses, the film rewinding motor is stopped and the film winding motor is operated,
An apparatus for automatically recovering a loading error of a camera, wherein the film winding motor is stopped when the film feed detecting means generates a predetermined number of pulses. 5. The film control device according to claim 4, wherein the motor control means operates the film rewinding motor when a loading error occurs and the film feed detection means does not generate a pulse within a predetermined time. Automatic loading error recovery device that stops the rewinding motor and displays an error. 6. The film rewinding device according to claim 4 or 5, wherein the motor control means, when the film feed detection means does not generate a predetermined number of pulses even if the film winding motor is operated after a loading error occurs, Automatic loading error recovery device that alternately operates the motor and the film winding motor. 7. The number of pulses for switching between the film rewinding operation and the film winding operation when the film rewinding operation of the film rewinding motor and the film feeding operation of the film winding motor are repeatedly performed according to claim 6. Automatic loading error recovery device that changes every time. 8. The automatic loading error recovery device according to claim 4, wherein the film rewinding motor and the film rewinding motor are common motors.